Dear Mr. Sonnenreich -- first of all, I wanted to tell you how much I
enjoyed your book, 'Linux and OpenBSD Firewalls'. I have read it cover
to cover, and I'm using it as a guide for setting up an OpenBSD
firewall. It was clear and to the point, and very well written.
Having said all that ;-), I do have a quick question. On page 240, you
make note of the fact that;
"There is a downside to the union mount: Your changes are not permanent.
When the device is unmounted, all of your changes are lost."
I'm not sure I understand. For example, I have installed 2.7 of OpenBSD
from the CD, and I'm in the process of applying all of the patches to
bring it up to date. If I use the union mount technique, and at some
point down the road, a patch is issued that updates a current patch, will
I have to reapply both patches?
I'm not sure if I am explaining myself particularly well, but if you need
further clarification of the question, please let me know...thank you...